JP2005175746A - Portable communication terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set a proper volume corresponding to a reception speech level even after a first speaker is switched to a second speaker, in a portable communication terminal device provided with the first speaker to be pressed onto an ear to listen to sounds and the bone conduction type second speaker to be pressed onto a cheek bone to listen to sounds. <P>SOLUTION: This portable communication terminal device is provided with a reception speech level detector 66 for detecting reception speech level representing the size of reception speech volume from a received audio signal; a volume adjuster 67 for adjusting the volume of sound to be outputted from the second speaker; and a volume setting means for deciding a proper volume value corresponding to the speech level detected by the detector 66, and setting the volume value to the adjuster 67. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication terminal such as a mobile phone, and more particularly to a communication terminal including a bone conduction speaker.

A telephone handset equipped with a so-called bone-conducting speaker has been proposed as a telephone that can sufficiently listen to a received sound even for a user who has a poor hearing function such as an elderly person (see Patent Document 1).
When performing transmission / reception with this type of transmitter / receiver, a bone conduction speaker provided in the transmitter / receiver is pressed against the cheekbone. As a result, the vibration emitted from the bone conduction type speaker is transmitted to the cochlea through the skull, and the vibration is converted into an electric signal by the cochlea, and the electric signal is transmitted to the brain through the auditory nerve, and as a result, the voice is recognized. Is possible.
JP2003-17496A [H04M1 / 03]

Therefore, in a mobile phone in which a transmitter and receiver are provided in a portable casing, both a speaker (first speaker) and a bone conduction speaker (second speaker), which are conventional general receivers, are used as the receiver. Can be deployed. According to the mobile phone, for example, in a call with a lot of noise such as in a crowd, the received sound can be easily heard by switching from the first speaker to the second speaker.
Note that in a conventional general speaker, a reception level indicating the volume of the reception volume is detected from a received audio signal, and the volume value is adjusted according to the detected reception level.

However, the conventional general speaker (first speaker) transmits the sound by applying air vibration to the eardrum, whereas the bone conduction speaker (second speaker) directly vibrates against the cheekbone. In addition, because it conveys sound, the appropriate volume value for the first speaker is inappropriate for the second speaker, and the volume value remains unchanged when switching from the first speaker to the second speaker. If so, the volume becomes too large or too small to make it difficult to hear the received sound.
In particular, in a bone conduction type speaker, since the volume range that is easy to hear is narrow, a problem remains in volume adjustment similar to the first speaker.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a portable communication terminal having both a speaker (first speaker) and a bone conduction type speaker (second speaker) as a conventional general receiver. It is to provide a mobile communication terminal in which an appropriate volume is set according to the reception level even after switching to.

In the portable communication terminal according to the present invention, a first speaker (24) and a second speaker (4) are arranged in a portable casing, and the received audio signal is transmitted to the first speaker (24) or the second speaker (4). ) Can be output as audio from either one of
Detecting means for detecting a reception level representing the magnitude of the reception volume from the received audio signal;
Speaker selection means for turning on either the first speaker (24) or the second speaker (4);
Volume adjusting means for adjusting the volume of the sound output from the second speaker (4) in accordance with the set volume value;
For the second speaker (4), table means for storing an appropriate volume setting value according to the reception level;
A volume setting means for determining a volume value according to the reception level detected by the detection means and setting the volume adjustment means with reference to the table means when the second speaker (4) is selected; It has.

  Specifically, the table means stores a plurality of volume setting values that lower the volume when the reception level is high and increase the volume when the reception level is low.

In the portable communication terminal of the present invention, the first speaker 24 is turned off and the second speaker 4 is turned on from the state where the first speaker 24 is on and the second speaker 4 is off. In this case, the reception level is detected from the received audio signal, and the volume setting value appropriate for the second speaker (4) is read from the table means according to the reception level, and the second speaker (4) is read out. Set as volume value. Then, the volume of the sound output from the second speaker (4) is adjusted according to the set volume value.
Therefore, the sound output from the second speaker (4) does not become excessive or excessive.

  In a specific configuration, the casing is configured by connecting a pair of cabinets (1) and (2) so as to be openable and closable, and the first speaker (on the casing inner surface exposed by opening both cabinets (1) and (2)). 24), and the second speaker (4) is provided on the back of the casing. By opening both cabinets (1) and (2), the first speaker (24) is turned on and the second speaker (4) is turned on. On the other hand, by closing both cabinets (1) and (2), the first speaker (24) is turned off and the second speaker (4) is turned on.

  In the specific configuration, with the pair of cabinets (1) and (2) opened, the first speaker (24) is turned on and the first speaker (24) is pressed against the ear to listen to the sound. I can do it. On the other hand, when the pair of cabinets (1) and (2) are closed, the second speaker (4) is turned on and the sound can be heard by pressing the second speaker (4) against the cheekbone. .

Further, in a specific configuration, the volume setting means repeatedly calculates an average value of the reception level within a predetermined period at a constant cycle, and sets the volume value based on the calculated average reception level.
As a result, it is possible to avoid an unnecessary change in the volume value in response to a temporary and sudden change in the reception level due to mixing of noise sound or the like.

In a more specific configuration, the volume setting means updates the volume value based on the current value only when the current value of the average received level obtained at the predetermined period is larger than the previous value, and the current value of the average received level When the value is smaller than the previous value, the volume value is updated based on the average reception level after a certain period.
In this specific configuration, as a general rule, the volume value is changed in a cycle longer than the cycle of the average processing of the reception level, but even if the current value of the average reception level is larger than the previous value, Since the volume value is to be changed, frequent changes in the volume value are avoided when the increase in the average reception level is below a certain value, but immediately when the fluctuation range in the average reception level exceeds a certain value It is possible to prevent the volume output from the second speaker (4) from becoming excessive by changing the volume value.

  According to the portable communication terminal of the present invention, an appropriate volume corresponding to the reception level is set even after switching from the conventional general first speaker to the bone conduction type second speaker.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention applied to a foldable mobile phone will be specifically described below with reference to the drawings.
In the foldable mobile phone according to the present invention, as shown in FIGS. 1 to 3, the operation side cabinet (1) and the display side cabinet (2) are connected to each other via a hinge mechanism (3) so as to be opened and closed. A foldable casing is constructed.

As shown in FIG. 3, a plurality of operation keys (11) including a numeric keypad and a ring key are provided on the inner surface of the operation side cabinet (1), and a side key (15) is provided on the side surface. Yes. The operation side cabinet (1) is provided with a transmitter (12) having a built-in microphone (13) at the end opposite to the hinge mechanism (3).
On the inner surface of the display-side cabinet (2), there is a main display (21) consisting of a liquid crystal panel, and at the end opposite to the hinge mechanism (3), a first speaker (24) is built-in. Department (22) is deployed.

Further, as shown in FIGS. 1 and 2, a sub-display (23) is provided at the center of the back side of the display-side cabinet (2), and an elastic member is provided at the end on the hinge mechanism (3) side. A bone conduction type second speaker (4) is provided via (5).
As shown in FIG. 1, a concave portion is formed on the surface of the transmitter (12) so that a part of the transmitter (12) is exposed with both cabinets (1) and (2) closed. ing.
The display-side cabinet (2) has a shape in which the surface protrudes from the end opposite to the hinge mechanism (3) toward the installation portion of the second speaker (4), and follows the shape. The sub-display (23) is installed in an inclined posture.

  FIG. 4 shows the electrical configuration of the foldable mobile phone of the present invention. As shown in the drawing, an RF circuit (62) to which an antenna (61) is connected is connected to a control circuit (6) composed of an ASIC, DSP, CPU and the like. The control circuit (6) is connected to the operation key (11) and the side key (15) described above, a clock generator (64) for generating a clock to be used for control operation, and a power supply to necessary circuit units. A system power supply IC (65) to be supplied and an interface (63) for connecting an external communication device or the like are connected.

The control circuit (6) is connected to a codec (7) for performing modulation / demodulation processing. The codec (7) is used for the earphone in addition to the microphone (13) and the first speaker (24). A microphone (14) is connected. The codec (7) is connected to the second speaker (4) via an amplifier (71) controlled on / off by an ON / OFF control signal from the control circuit (6). A notification speaker (16) is connected via a sound source IC (72) for emitting a melody or the like.
Furthermore, the memory (73) is connected to the control circuit (6) through the control bus, and the main display (21) and the sub display (23) are connected through the LCD driver (74). Yes.

  As shown in FIG. 5, the control circuit (6) includes a reception level detection unit (66) for detecting a reception level indicating the volume of the reception volume from the received audio signal, and a volume of the audio signal to be output to the second speaker. A volume adjustment unit (67) for adjusting the volume, an AGC control unit (68) for determining a volume value according to the reception level detected by the reception level detection unit (66), and supplying the volume value to the volume adjustment unit (67); An interrupt control unit (69) is provided for instructing the AGC control unit (68) to perform interrupt processing with a cycle of 20 milliseconds.

In the AGC control unit (68), as shown in FIG. 7, appropriate volume setting values for the second speaker (4) are stored as a table corresponding to each of the six levels of reception levels.
FIG. 8 illustrates the reception level and volume setting value in decibel (dB) converted values in FIG. 7 and the output value of the audio signal to be output by the control circuit (6). As shown in the figure, the six volume setting values 1 to 6 are set to decibel conversion values that greatly lower the volume when the reception level is high and increase the volume when the reception level is low.

According to the above foldable mobile phone, as shown in FIG. 1, in the state where both cabinets (1) and (2) are folded, the transmission / reception can be performed by the transmitter (12) and the bone conduction type second speaker (4). In addition, as shown in FIG. 3, with both cabinets (1) and (2) being opened, it is possible to send and receive speech using the transmitter (12) and the normal first speaker (24).
It is also possible to switch the speakers between the first speaker 24 and the second speaker 4 by opening or closing both cabinets 1 and 2 during a call.

FIG. 6 shows a control procedure executed by the control circuit (6).
In a state in which a mode enabling the operation of the bone conduction type second speaker (4) is set, it is first determined whether or not there is an incoming call in step S1, and if it is determined to be yes, the process proceeds to step S2. To determine whether there has been an off-hook operation.

  If it is determined as YES in step S2, after starting the communication operation in step S3, it is determined whether or not the casing is opened in step S4. If it is determined that the casing is open and the answer is YES, the first speaker 24 is turned on and the second speaker 4 is turned off in step S5, and then volume adjustment processing is performed as necessary. After performing (not shown), the process proceeds to step S12.

On the other hand, if the casing is closed at the start of the call and it is determined NO in step S4, the first speaker (24) is turned off and the second speaker (4) is turned on in step S6. At S7, the table of FIG. 7 is read.
Subsequently, in step S8, a process of calculating an average value of the reception level for 1 second with a period of 20 milliseconds is started. In step S9, it is determined whether one second has elapsed since one average reception level is obtained. If it is determined NO, the process proceeds to step S10, where the current value of the average reception level is determined. Judge whether or not the previous value is exceeded. If it is determined NO, the process returns to step S8, and the average value calculation process of the received level is repeated.

Thereafter, when it is determined as YES in step S9 after the lapse of 1 second, the average reception level is determined from the table of FIG. 7 based on the average reception level obtained at the time when 1 second has elapsed in step S11. After reading the volume setting value and setting it as the volume value for the second speaker (4), the process proceeds to step S12.
If the current value of the average reception level exceeds the previous value and it is determined YES in step S10, the process proceeds to step S11, and the volume corresponding to the current value is determined from the table based on the current value. After reading the set value and setting it as the volume value for the second speaker (4), the process proceeds to step S12.

  In step S12, it is determined whether or not there has been an on-hook operation. If it is determined no, the process returns to step S4, and the procedures of steps S4 to S12 are repeated according to the open / close state of the casing. Thereafter, when there is an on-hook operation and it is determined YES in step S12, the process proceeds to step S13, and the communication operation is terminated.

  In the above foldable mobile phone according to the present invention, when the first speaker (24) is off and the second speaker (4) is on, the second speaker (4) depends on the reception level of the received audio signal. 7 is read from the table of FIG. 7 and set as the volume value of the second speaker (4), so that the output of the second speaker (4) is always appropriate regardless of the level of the reception level. It can be maintained in a large size.

  In addition, the average value of the reception level for 1 second is calculated with a period of 20 milliseconds, and the volume value is set based on the calculated average reception level. The volume value does not change in response to the change.

  Furthermore, as a general rule, the volume value is changed at a cycle of 1 second longer than 20 ms, which is the average processing level of the reception level, but when the current value of the average reception level is greater than the previous value, 1 second. Since the volume value is changed even before the period arrives, frequent changes in the volume value are avoided when the increase in the average reception level is below a certain value, while fluctuations in the average reception level occur. When the width exceeds a certain value, the volume value is immediately changed to prevent an excessive volume from being output from the second speaker (4).

  In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, the sensitivity of the microphone (13) is not limited to a configuration in which the sensitivity is kept constant regardless of whether the casing is opened or closed, and a configuration in which the sensitivity is increased by closing the casing from an open state can be adopted.

It is a perspective view which shows the state which folded the foldable mobile telephone which concerns on this invention. It is a top view which shows a state same as the above. It is a perspective view which shows the state which opened this foldable mobile telephone. It is a block diagram which shows the electric constitution of this foldable mobile telephone. It is a block diagram which shows the function structure of a control circuit. It is a flowchart showing the control procedure by a control circuit. It is a graph which shows the relationship between a receiving level and a volume adjustment value. It is a graph which shows the decibel conversion value of a receiving level and a volume setting value.

Explanation of symbols

(1) Operation side cabinet
(11) Operation keys
(12) Transmitter
(13) Microphone
(15) Side key
(2) Display side cabinet
(21) Main display
(22) Earpiece
(23) Sub display
(24) First speaker
(4) Second speaker
(6) Control circuit

Claims (5)

A portable casing is provided with a first speaker (24) to be pressed against the ear to hear the sound and a bone conduction type second speaker (4) to be pressed against the cheekbone to hear the sound, and the received audio signal In a portable communication terminal capable of outputting sound from either the first speaker (24) or the second speaker (4) as sound,
Detecting means for detecting a reception level representing the magnitude of the reception volume from the received audio signal;
Speaker selection means for turning on either the first speaker (24) or the second speaker (4);
Volume adjusting means for adjusting the volume of the sound output from the second speaker (4) in accordance with the set volume value;
For the second speaker (4), table means for storing an appropriate volume setting value according to the reception level;
A volume setting means for determining a volume value according to the reception level detected by the detection means and setting the volume adjustment means with reference to the table means when the second speaker (4) is selected; A portable communication terminal characterized by comprising:   2. The mobile communication terminal according to claim 1, wherein the table means stores a plurality of volume setting values that lower the volume when the reception level is high and increase the volume when the reception level is low.   The casing is configured by connecting a pair of cabinets (1) and (2) so as to be openable and closable, and the first speaker (24) is disposed on an inner surface of the casing exposed by opening both cabinets (1) and (2). In addition, the second speaker (4) is arranged on the back of the casing, and by opening both cabinets (1) and (2), the first speaker (24) is turned on and the second speaker (4) is turned off. The portable communication terminal according to claim 1 or 2, wherein the first speaker (24) is turned off and the second speaker (4) is turned on by closing both cabinets (1), (2).   The mobile volume according to any one of claims 1 to 3, wherein the volume setting means repeatedly calculates an average value of the reception level within a predetermined period in a predetermined cycle, and sets the volume value based on the calculated average reception level. Communication terminal. The volume setting means updates the volume value based on the current value only when the current value of the average reception level obtained at the predetermined period is larger than the previous value, and the current value of the average reception level is smaller than the previous value. 5. The portable communication terminal according to claim 4, wherein the volume value is updated based on an average reception level after a predetermined period.

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